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| Natura: | Preprint |
| Pubblicazione: |
2024
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| Accesso online: | https://arxiv.org/abs/2411.05070 |
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| _version_ | 1866916472980242432 |
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| author | Zhang, Yue |
| author_facet | Zhang, Yue |
| contents | Neutrino self-interaction with a larger ``Fermi constant'' is often resorted to for understanding various puzzles of our universe. We point out that a light, neutrinophilic scalar particle $ϕ$ through radiative correction leads to an energy-scale dependence in the neutrino-$Z$-boson gauge coupling. The driver behind this phenomenon is a large separation between the mass scales of $ϕ$ and additional heavy particles needed for gauge invariance. This is a generic effect insensitive to details of the UV completion. We show that the running can change the $Zν\barν$ coupling by several percent and affect the measurement of weak mixing angle through neutrino neutral-current processes. We discuss the interplay between the running of the $Zν\barν$ coupling and $\sin^2θ_W$ in various experimental observables. It is possible to disentangle the two effects with more than one precise measurement. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_05070 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Neutrino Self-interaction and Weak Mixing Angle Measurements Zhang, Yue High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Physics - Experiment Neutrino self-interaction with a larger ``Fermi constant'' is often resorted to for understanding various puzzles of our universe. We point out that a light, neutrinophilic scalar particle $ϕ$ through radiative correction leads to an energy-scale dependence in the neutrino-$Z$-boson gauge coupling. The driver behind this phenomenon is a large separation between the mass scales of $ϕ$ and additional heavy particles needed for gauge invariance. This is a generic effect insensitive to details of the UV completion. We show that the running can change the $Zν\barν$ coupling by several percent and affect the measurement of weak mixing angle through neutrino neutral-current processes. We discuss the interplay between the running of the $Zν\barν$ coupling and $\sin^2θ_W$ in various experimental observables. It is possible to disentangle the two effects with more than one precise measurement. |
| title | Neutrino Self-interaction and Weak Mixing Angle Measurements |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2411.05070 |